jawless vertebrate
English Thesaurus
1. eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms (noun.animal)
| hypernym | : | aquatic vertebrate, |
| definition | : | animal living wholly or chiefly in or on water (noun.animal) |
| hyponym | : | ostracoderm, |
| definition | : | extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic (noun.animal) |
| hyponym | : | heterostracan, |
| definition | : | extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian (noun.animal) |
| hyponym | : | anaspid, |
| definition | : | extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian (noun.animal) |
| hyponym | : | conodont, |
| definition | : | small (2 inches long) extinct eellike fish with a finned tail and a notochord and having cone-shaped teeth containing cellular bone; late Cambrian to late Triassic; possible predecessor of the cyclostomes (noun.animal) |
| hyponym | : | cyclostome, |
| definition | : | primitive aquatic vertebrate (noun.animal) |
| hyponym | : | lamper eel, lamprey, lamprey eel, |
| definition | : | primitive eellike freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue (noun.animal) |
| hyponym | : | hag, hagfish, slime eels, |
| definition | : | eellike cyclostome having a tongue with horny teeth in a round mouth surrounded by eight tentacles; feeds on dead or trapped fishes by boring into their bodies (noun.animal) |
| member meronym | : | agnatha, superclass agnatha, |
| definition | : | superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreys; hagfishes; some extinct forms (noun.animal) |
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